diff --git a/src/libexpr/flake/flake.cc b/src/libexpr/flake/flake.cc
index e1c9f4ad4..81a1d3090 100644
--- a/src/libexpr/flake/flake.cc
+++ b/src/libexpr/flake/flake.cc
@@ -682,14 +682,6 @@ LockedFlake lockFlake(
                             flake->lockedRef.input.getRev() &&
                             prevLockedRef.input.getRev() != flake->lockedRef.input.getRev())
                             warn("committed new revision '%s'", flake->lockedRef.input.getRev()->gitRev());
-
-                        /* Make sure that we picked up the change,
-                           i.e. the tree should usually be dirty
-                           now. Corner case: we could have reverted from a
-                           dirty to a clean tree! */
-                        if (flake->lockedRef.input == prevLockedRef.input
-                            && !flake->lockedRef.input.isLocked())
-                            throw Error("'%s' did not change after I updated its 'flake.lock' file; is 'flake.lock' under version control?", flake->originalRef);
                     }
                 } else
                     throw Error("cannot write modified lock file of flake '%s' (use '--no-write-lock-file' to ignore)", topRef);
diff --git a/src/libfetchers/git.cc b/src/libfetchers/git.cc
index 34e1a8975..4505a6222 100644
--- a/src/libfetchers/git.cc
+++ b/src/libfetchers/git.cc
@@ -741,6 +741,8 @@ struct GitInputScheme : InputScheme
             input.attrs.insert_or_assign(
                 "revCount",
                 getRevCount(repoInfo, repoInfo.url, *input.getRev()));
+
+            input.locked = true;
         }
 
         // FIXME: maybe we should use the timestamp of the last
diff --git a/src/libfetchers/github.cc b/src/libfetchers/github.cc
index da115478e..b27151cff 100644
--- a/src/libfetchers/github.cc
+++ b/src/libfetchers/github.cc
@@ -192,6 +192,8 @@ struct GitArchiveInputScheme : InputScheme
         auto rev = input.getRev();
         if (!rev) rev = getRevFromRef(store, input);
 
+        input.locked = true;
+
         input.attrs.erase("ref");
         input.attrs.insert_or_assign("rev", rev->gitRev());